CVE-2021-41372: Power BI Report Server Spoofing Vulnerability

Overview

Severity

High (CVSS 7.6)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N/E:P/RL:O/RC:C

Category

Spoofing

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2021-Nov

Released

2021-11-09

Last Updated

2022-04-15

EPSS Score

0.23% (percentile: 46.2%)

Description

A Cross-Site Scripting (XSS) and Cross-Site Request Forgery (CSRF) vulnerability exists when Power BI Report Server Template file (pbix) containing HTML files is uploaded to the server and HTML files are accessed directly by the victim. Combining these 2 vulnerabilities together, an attacker is able to upload malicious Power BI templates files to the server using the victim's session and run scripts in the security context of the user and perform privilege escalation in case the victim has admin privileges when the victim access one of the HTML files present in the malicious Power BI template uploaded. The security update addresses the vulnerability by helping to ensure that Power BI Report Server properly sanitize file uploads.

Affected Products (2)

SQL Server

• Power BI Report Server version 1.11.8091.10468
• Power BI Report Server version 1.12.7977.29537

Security Updates (1)

• 5007903

Acknowledgments

Emanuele Barbeno with <a href="https://www.compass-security.com/en/">Compass Security</a>

Revision History

• 2021-11-09: Information published.
• 2022-04-15: In the Security Updates table, the following revisions have been made: 1) Added &quot;version 1.12.7977.29537&quot; to Power BI Server entry. 2) Added Power BI Server version 1.11.8091.10468 to the table as it is also affected by this vulnerability. 3) Added Fixed Build numbers to indicate which build contains the fix that addresses this vulnerability.